According to Ceperley's calculation, higher efficiency is possible with higher impedance, e.g., if z = 10ρm^c, η_2 reaches 79%. In order to achieve z = 10ρm^c, he explained the cross-sectional area of the enlarged tube would have to be 10 times larger than that of the input tube. On the other hand, losses caused by sudden expansions in regenerator was found. It can be reduced somewhat by installing a tapered tube between the two sections of straight tube. In this report, we changed the cross sectional area of the regenerator using tapered tube so it is larger than input tube, and measured its thermal efficiency and acoustic power gain at regenerator positions of a traveling wave heat engine.
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